Malicious PDF — malware analysis report

Static analysis result for SHA-256 459a3f5e72ba1512…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 06:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 961d9067c5f78011cd7e86244d413453 SHA-1: b539ff19ebcd5bf5057029cad0fdc4b7cfbe33e4 SHA-256: 459a3f5e72ba151257d9dd3b03ab85c878348077307efff2d2ad1542affc3c98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/123?utm_term=1987+suzuki+quadrunner+250+oil+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505699/normal_601af55ee42cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473379/normal_5ff3b07939a15.pdfIn PDF document text
    • http://madewithsunshine.com/ecg_made_incredibly_easy_downloadb6hsx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_600f9339788df.pdfIn PDF document text
    • http://myfavoritesun.xyz/zofapovakax5dm0x.pdfIn PDF document text
    • http://ru-payment.casa/limonibulidisadamawarozraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_5fd1b4f8e16ee.pdfIn PDF document text
    • http://nikaold.site/80137298209sa3ny.pdfIn PDF document text
    • http://pubgmobiie.com/effective_c_book80bui.pdfIn PDF document text
    • http://gnatural.space/asus_p8z77-v_lx_flash_biosirbxw.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/new_world_of_darkness_mirrorsse5x4.pdfIn PDF document text
    • http://devlp.design/fapasudejanawung9p9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/firudegix/lotasinejinadafeni.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/long_sleeve_shirt_template_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 5924 bytes
SHA-256: 400f235c800084315ddfe5203c164271b591411572cd3b7bd6ac9ef059d28b20
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 10644 bytes
SHA-256: cf6ce4019ae1f530066f37750e83231f73c1fc3114d3053b75be8d92b38608bd

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